I downloaded a movie (MKV) 3.76 Gb and when I played it, it stopped playing after 18 seconds but the time kept advancing as normal. I converted it to an AVI, 661MB but it performed exactly the same.
Is there anything in the menu or anything else that would correct this malfunction?
OS 10.12.6 iMac (Retina 5K, 27", 2017, 3.4 GHz Intel Core i5, 24 GB RAM, 2400 MHz DDR4. Sierra. 10.12.6 SuperDuper. 1 TB Lacie HD, Noise Ninja.